Coated pipes for harsh environments

Abstract

The present invention relates to a pipe, especially an oil pipe, having a lining comprising a fluoropolymer adhered to its interior surface and a lining formed on its exterior surface. The interior and/or exterior lining may comprise a primer layer comprising a fluoropolymer, and preferably a perfluoropolymer and an overcoat or a preformed film adhered to the primer layer. Either the overcoat or the preformed liner also comprises a fluoropolymer, and preferably a perfluoropolymer. The surface of the lining facing the flowable media, such as oil, may be a pure perfluoropolymer to provide a particularly good non-stick surface for the oil.

1. A rigid pipe for conveying flowable media comprising a lining adhered to the interior surface of the pipe and an insulating lining formed on the exterior surface of the pipe, wherein the lining adhered to the interior surface of the pipe comprises a primer layer comprising fluorine-free polymer binder adhered to the interior surface of the pipe and a fluoropolymer overcoat applied to the primer layer. 
     
     
       2. The pipe of  claim 1 , wherein the lining adhered to the interior surface of the pipe comprises perfluoropolymer. 
     
     
       3. The rigid pipe of  claim 1 , wherein said fluoropolymer overcoat is a tubular liner adhered to the primer layer.